A medical needle manufacturing method, a medical needle manufacturing apparatus, and a medical needle are disclosed capable of suppressing the generation of a level difference and burrs/flashes in a boundary section between a needle hub and a needle body in an inner peripheral portion of the needle hub. The manufacturing method of a medical needle includes a large-diameter-portion molding step of molding, by a core pin, a large-diameter portion in a proximal portion of a needle body； a core-pin backward-movement step of moving backward the core pin by a predetermined distance relatively to the needle body； and an injection molding step of molding a needle hub by injecting a resin into an injection molding mold.
